A permanent magnet in the shape of a thin cylinder of length 10 cm has `M=10^(6)A//m`. Calculate the magnetisation current `I_(M)`.

Options

A. `10^(5)A`
B. `10^(12)A`
C. `2xx10^(8)A`
D. `5xx10^(10)A`

Answer

A

Explanation

Given, M(intensity of magnetisation)`=10^(6)` A/m. ltbr. `1("length")=10cm=10xx10^( -2)m=0.1m`
and `I_(M)=` magnetesation current
we know that `M=(I_(M))/(l)`
`rArr I_(M)=Mxxl`
` =10^(6)xx0.1=10^(5)A`